If the layer 218 Construction Line is not displayed, set
it visible by using the Layers > Select Layers from List
function.
Select
Placement: Wall middle.
Select the wall points 1, 2 and 3 from the center line of the
wall in the reference drawing. If necessary, lock the cursor in the
y and x axis direction in turns.
Lock the cursor in the y axis direction and click the point 4
from the roof line as in the figure below.